EP0343300A2 - Arrangement de montage pour un segment de piston multiple - Google Patents

Arrangement de montage pour un segment de piston multiple Download PDF

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Publication number
EP0343300A2
EP0343300A2 EP88311293A EP88311293A EP0343300A2 EP 0343300 A2 EP0343300 A2 EP 0343300A2 EP 88311293 A EP88311293 A EP 88311293A EP 88311293 A EP88311293 A EP 88311293A EP 0343300 A2 EP0343300 A2 EP 0343300A2
Authority
EP
European Patent Office
Prior art keywords
piston
piston ring
ring
gap
rings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP88311293A
Other languages
German (de)
English (en)
Other versions
EP0343300A3 (fr
Inventor
Mitsuhiro Kanao
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Individual
Original Assignee
Individual
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Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0343300A2 publication Critical patent/EP0343300A2/fr
Publication of EP0343300A3 publication Critical patent/EP0343300A3/fr
Withdrawn legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J10/00—Engine or like cylinders; Features of hollow, e.g. cylindrical, bodies in general
    • F16J10/02—Cylinders designed to receive moving pistons or plungers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/12—Details
    • F16J9/24—Members preventing rotation of rings in grooves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
    • F16J9/12—Details
    • F16J9/14—Joint-closures
    • F16J9/16—Joint-closures obtained by stacking of rings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/02—Engines characterised by their cycles, e.g. six-stroke
    • F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
    • F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two

Definitions

  • This invention relates to a mounting structure of a multiple piston ring for various internal combustion engines such as particularly a two cycle engine.
  • a conventional dual piston ring was invented in the 1930's. Such a dual piston ring had been used for the purpose of e.g. discharging any oil dust irrespective of its airtight maintenance, but nowadays, is rarely used. Any piston ring for packing purpose is disposed in a cylindrical groove formed upon an outer surface of a piston.
  • the profile of a gap in such a piston ring is various: namely, 1) a right-angled type gap (e.g. shown in Fig. 1 or Fig. 7), 2) an inclined type gap, 3) a step type gap, 4) a two-step type gap, etc.
  • the gas leakage in such piston ring is mostly caused through the gap.
  • adjacent piston rings have respective step on their opposing side wall, the gas leakage is very little, but its machining process is expensive, and danger of fracture of the piston ring is probable. Accordingly, this type is scarecely used.
  • the right-angled type gap and the inclined type gap can be formed by a simple machining work, and are very popular. Yet, the quantity of the gas leakage is much due to such a gap.
  • a gas G is leaked from a gap Ex between adjacent side walls of a piston ring PR, so that a preferred packing effect cannot be attained. It brings a decline of an engine output and a discharge of an exhaust gas.
  • the springiness of the piston ring is generally weak, namely about 1 to 2 kg/cm2, while the combustion gas pressure of the gasoline engine is 35 kg/cm2 and that of the diesel engine is 60 kg/cm2.
  • the piston ring cannot resist such a high pressure gas.
  • it maintains a weak fitting condition for a cylinder due to its weak springiness, thereby a unique packing effect is attained. More specifically, when such a high pressure gas is applied to the piston ring, it is penetrated into a back side of the piston ring through a gap about 0.05 mm, thereby the back side of it is pressurized and a high packing effect is attained.
  • the piston ring which is used today is provided with a gap of 0.5 to 1.00 mm in width. For this reason, the high pressure gas is freely passing through the gap, so that a sufficient packing effect is not obtained. Further, when the outer circumference of the piston ring is worn out, the gap of the piston ring is enlarged, so that the packing effect is reduced. In view of the above, this invention has been accomplished.
  • This invention provides a mounting structure of a multiple piston ring having a suitable packing effect, in which respective gaps of a plurality of piston rings disposed in a groove of a piston are spaced with a certain distance.
  • a gap of a top ring cannot face to a gap of a second ring, only a gap of the top ring through which a gas passes is blocked, while a gap of the second ring is opened, so that a high pressure gas is penetrated into such a opened gap, and a back side of the piston ring is pressurized by such a high pressure gas.
  • a suitable packing effect is maintained.
  • this invention provides a mounting structure of a multiple piston ring, in which a stop pin is mounted on a piston wall or formed in a gap of a piston ring in order to prevent any rotation of the piston ring.
  • the multiple piston ring can be easily inserted into a cylinder, and its manufacturing cost becomes lower.
  • this invention provides mounting structure of a multiple piston ring, in which a ring-shaped resilient member is mounted between a second ring and a groove for the multiple piston ring, thereby any gas leakage from the gap of the piston ring can be prevented entirely.
  • a piston P consists of a top piston ring PR1 and a second piston ring PR2, which are fitted to each other within a groove GR of the piston P, so that a first gap Ex1 of the top piston ring PR1 cannot face directly to a second gap Ex2 of the second piston ring PR2.
  • piston P consists of two piston rings, one gap is shifted at 180 degrees relative to the other gap. If the piston P consists of three piston rings, respective gaps are spaced with each other by every 120 degrees.
  • piston P consists of four piston rings, respective gaps are spaced with each other by every 90 degreees.
  • the respective piston rings must be closely fitted to each other.
  • Numeral 3 is a stop pin which is disposed on a bottom of the groove GR of the piston P.
  • the stop pin 3 is to be engaged with the gaps Ex1 and Ex2 of the piston rings PR1 and PR2 respectively.
  • Fig. 5 shows a section view, in which three piston rings PR1, PR2 and PR3 are placed one above another in the groove GR of the piston P.
  • the profile of the gap in the present piston ring is a right-angled type, it can be manufactured at a low cost, and a complete packing effect can be obtained within one groove.
  • the gap it is not necessary to make the gap particularly narrower. For example, even though the gap is widened to about 5 mm, a sufficient air tightness can be maintained. Therefore, it is possible to dispose the stop pin within such a widened gap, so that any special space for the stop pin is entirely unnecessary. Thus, the manufacturing cost of the piston ring becomes inexpensive, and the insertion of the piston ring into the cylinder becomes easier.
  • Fig. 6 shows pressure distribution curves of three piston rings in Fig. 5, in which each curve has a pear-shaped oval profile of a length D1 and a width D2.
  • the three piston rings having such a triple curve is very effective particularly for any piston machines requiring a low speed driving and a low compression.
  • the internal combustion engine had two types of operation, namely a recoil hand starter (a rope start) and a electrically-­actuated start.
  • a recoil hand starter (a rope start)
  • a electrically-­actuated start First of all, the internal combustion engine was started electrically, and a test driving was conducted. Subsequently, it was driven by a rope start. As a result, a compressing pressure was increased due to the betterment of the packing effect. Then, even a physically stout operator was not able to start the engine by a rope.
  • a lubricating oil was purposely overcharged into a crank case, and an operation was conducted. Although some lubricating oil was blown off from a pipe mounted between a carburetor and the crank case to enhance a sucking effect, it was confirmed that any lubricating oil was not blown off from the piston. That is, any white fume showing lubricating oil leak was not found in the exhaust gas.
  • the piston ring is a very important part for maintaining a good performance of the internal combustion gas, but many people think that today's piston rings have no problems. However, the following points should be considered carefully.
  • Claim 3 is a further modification of claim 2.
  • the stop pin 3 is formed as a convex portion bulged on a surface of the second piston ring PR2.
  • one of the two piston rings has to be provided with the stop pin 3, but the other piston ring requires no stop pin.
  • the height of the bulged convex portion 3 is about 3 mm and of an angular type. Further, such bulged convex portion 3 is preferably integrally formed on the surface of the piston ring.
  • Embodiment 2 of this invention only one of the two piston rings requires the stop pin, so that the production cost of the piston becomes inexpensive. In addition, mounting of such a pair of piston rings into the cylinder becomes very easy.
  • the piston rings according to this invention are used particularly to prevent the gas leakage entirely, and very effective for a large-sclae diesel engine, in which the gap of the piston ring is relatively wider.
  • a ring-shaped resilient member 4 is disposed immediately inside the second piston ring PR2 in order to prevent a gas leakage from the gap EX2 of the second piston ring PR2.
  • the ring-shaped resilient member 4 is provided with a convex/concave profile in its direction.
  • the ring-shaped resilient member 4 can prevent any gas leakage from the gap EX2 by means of a springy expansion of the resilient member 4.
  • the top ring PR1, the second ring PR2 and the ring-shaped resilient member 4 are used as one pair.
  • the number of the top ring PR1 may be increased optionally.
  • Numeral 5 is a cylinder wall.
  • the ring-shaped resilient member 4 may be used as an auxiliary piston ring to prevent a gas leakage.
  • the multiple piston ring having such a ring-shaped resilient member is available for any type of piston machines such as e.g. a diesel engine having a high compression ratio.
  • the outer diameter of a piston of e.g. a large-scale marine diesel engine is 840 mm
  • the gap of the piston ring has been enlarged from 8 mm to 30 mm in the past four years.
  • the aforesaid ring-shaped resilient member can exhibit a superior sealing effect to prevent any gas leakage.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)
  • Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
EP19880311293 1988-05-25 1988-11-29 Arrangement de montage pour un segment de piston multiple Withdrawn EP0343300A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP128727/87 1988-05-25
JP63128727A JPH01299364A (ja) 1988-05-25 1988-05-25 ピストンリング

Publications (2)

Publication Number Publication Date
EP0343300A2 true EP0343300A2 (fr) 1989-11-29
EP0343300A3 EP0343300A3 (fr) 1990-11-07

Family

ID=14991949

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19880311293 Withdrawn EP0343300A3 (fr) 1988-05-25 1988-11-29 Arrangement de montage pour un segment de piston multiple

Country Status (4)

Country Link
US (1) US4962691A (fr)
EP (1) EP0343300A3 (fr)
JP (1) JPH01299364A (fr)
KR (1) KR890017478A (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0647804A1 (fr) * 1993-10-12 1995-04-12 Yamaha Hatsudoki Kabushiki Kaisha Moteur à combustion interne
US6055726A (en) * 1993-10-12 2000-05-02 Yamaha Hatsudoki Kabushiki Kaisha Method of forming a piston
WO2009050756A1 (fr) * 2007-10-17 2009-04-23 Giorgio Grossi Procédé et appareil d'optimisation du fonctionnement et de l'alimentation de moteurs endothermiques à deux temps, à employer en particulier dans le secteur industriel se rapportant aux micromoteurs du domaine du modélisme
EP2610532A1 (fr) * 2011-12-30 2013-07-03 FPT Industrial S.p.A. Unité d'étanchéité de piston de moteur à combustion interne
US9587501B2 (en) 2013-11-11 2017-03-07 General Electric Company Rotary machine secondary sealing assembly and method of assembling the same

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0480962U (fr) * 1990-11-27 1992-07-14
US5392692A (en) * 1994-03-14 1995-02-28 Ford Motor Company Antiblow-by piston and seal construction for high temperature applications
US5737999A (en) * 1997-03-14 1998-04-14 Southwest Research Institute Blowby pressure control above an oil control ring in a reciprocating internal combustion engine
US6378872B1 (en) * 1999-07-26 2002-04-30 Maurice J. Moriarty Seal assembly
US6457721B1 (en) 2001-01-26 2002-10-01 White Consolidated Industries, Inc. Piston ring locator
JP4575235B2 (ja) * 2005-05-13 2010-11-04 アネスト岩田株式会社 気体吸排装置
DE102007054929B4 (de) * 2007-11-17 2016-12-01 Andreas Stihl Ag & Co. Kg Handgeführtes Arbeitsgerät
EA014474B1 (ru) * 2008-02-05 2010-12-30 Игорь Владимирович Янковский Поршень для двигателя внутреннего сгорания
US8141476B2 (en) * 2008-05-21 2012-03-27 Jehn-Feng Liour Durable piston and a ring unit for the durable piston
JP2010243390A (ja) * 2009-04-08 2010-10-28 Honda Motor Co Ltd エンジンの摩擦力測定装置
US10036471B2 (en) * 2009-11-18 2018-07-31 Achates Power, Inc. Ported engine constructions with low-tension compression seals
KR101371744B1 (ko) * 2012-10-23 2014-03-07 현대자동차(주) 피스톤링 장착 구조
GB2578803B (en) * 2019-04-04 2020-12-16 Cox Powertrain Ltd Marine outboard motor with piston cooling gallery
JP2022099360A (ja) * 2020-12-23 2022-07-05 株式会社神戸製鋼所 ピストンリングユニットおよび圧縮機
US20240209942A1 (en) * 2022-12-23 2024-06-27 Pratt & Whitney Canada Corp. Seal assembly with anti-rotation feature

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB252261A (en) * 1925-02-24 1926-05-25 Henry George Barlow An improved piston or packing ring with sealing piece and spring
US1696424A (en) * 1924-09-18 1928-12-25 Thompson James Horace Compression and suction saving construction for piston rings
US2300518A (en) * 1940-03-08 1942-11-03 Hastings Mfg Co Anchored piston ring assembly and piston ring anchoring device
US2900213A (en) * 1958-06-13 1959-08-18 Aaron A Bruce Piston ring construction
FR2571114A1 (fr) * 1984-10-01 1986-04-04 Majorel Hubert Etancheite a la coupe de segments de piston

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US1605810A (en) * 1926-11-02 Piston and piston bllto
US1660846A (en) * 1928-02-28 Charles richard mcminh
GB191209969A (en) * 1912-04-26 1912-12-05 Madison Winfield Meredith Improvements in Packings for Rods, Shafts and the like.
US1277291A (en) * 1917-11-26 1918-08-27 Philemon B Canfield Piston-ring.
US1392308A (en) * 1920-11-19 1921-10-04 Silas T Doyle Piston-ring assemblage
US1510778A (en) * 1922-02-15 1924-10-07 Roy R Hart Piston
US1671526A (en) * 1927-05-10 1928-05-29 Percy M Gilmer Packing ring
US1835139A (en) * 1928-10-27 1931-12-08 Earl J Bullard Piston ring
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DE584404C (de) * 1931-02-07 1933-09-19 Rudolf Pawlikowski Dipl Ing Kolbendichtung, insbesondere fuer Pulverbrennkraftmaschinen
FR855790A (fr) * 1939-06-06 1940-05-20 Arrêtoir pour segments multiples
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US2465415A (en) * 1946-08-28 1949-03-29 Alliance Europ Packing ring arrangement for combustion engine pistons
GB656463A (en) * 1946-08-28 1951-08-22 Alliance Europ Sa Improvements in and relating to packing ring arrangements for combustion engine pistons
US2481553A (en) * 1947-12-23 1949-09-13 Williams Judson Piston and locked ring assembly and piston ring locking clip
US2606085A (en) * 1948-10-07 1952-08-05 Elmer C Kiekhaefer Piston ring lock
FR1030378A (fr) * 1950-12-30 1953-06-12 Perfectionnements apportés aux expendeurs des segments de pistons et à leur montage dans les gorges des pistons
GB750949A (en) * 1954-01-26 1956-06-20 Alfred Bergeron Improvements in piston packing rings
CH333662A (de) * 1955-10-07 1958-10-31 Szigeti Elemer Kolbenring, insbesondere mehrteiliger Kolbenring, mit Andruckfeder
GB916265A (en) * 1960-02-19 1963-01-23 Wellwothy Ltd Improvements in or relating to composite piston ring arrangements
US3346252A (en) * 1963-06-17 1967-10-10 Sealed Power Corp Narrow width piston ring and expander-spacer
US3391943A (en) * 1965-10-23 1968-07-09 George F. Riley Anti-smog piston and ring assembly
US4367702A (en) * 1981-01-30 1983-01-11 Outboard Marine Corporation Internal combustion engine with automatic compression release

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1696424A (en) * 1924-09-18 1928-12-25 Thompson James Horace Compression and suction saving construction for piston rings
GB252261A (en) * 1925-02-24 1926-05-25 Henry George Barlow An improved piston or packing ring with sealing piece and spring
US2300518A (en) * 1940-03-08 1942-11-03 Hastings Mfg Co Anchored piston ring assembly and piston ring anchoring device
US2900213A (en) * 1958-06-13 1959-08-18 Aaron A Bruce Piston ring construction
FR2571114A1 (fr) * 1984-10-01 1986-04-04 Majorel Hubert Etancheite a la coupe de segments de piston

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0647804A1 (fr) * 1993-10-12 1995-04-12 Yamaha Hatsudoki Kabushiki Kaisha Moteur à combustion interne
US5782217A (en) * 1993-10-12 1998-07-21 Yamaha Hatsudoki Kabushiki Kaisha Piston for two cycle engine
US6055726A (en) * 1993-10-12 2000-05-02 Yamaha Hatsudoki Kabushiki Kaisha Method of forming a piston
WO2009050756A1 (fr) * 2007-10-17 2009-04-23 Giorgio Grossi Procédé et appareil d'optimisation du fonctionnement et de l'alimentation de moteurs endothermiques à deux temps, à employer en particulier dans le secteur industriel se rapportant aux micromoteurs du domaine du modélisme
EP2610532A1 (fr) * 2011-12-30 2013-07-03 FPT Industrial S.p.A. Unité d'étanchéité de piston de moteur à combustion interne
WO2013098051A1 (fr) * 2011-12-30 2013-07-04 Fpt Industrial S.P.A. Unité d'étanchéité de piston d'un moteur à combustion interne
US20150007791A1 (en) * 2011-12-30 2015-01-08 Fpt Industrial S.P.A. Seal unit of a piston of an internal combustion engine
US9587501B2 (en) 2013-11-11 2017-03-07 General Electric Company Rotary machine secondary sealing assembly and method of assembling the same

Also Published As

Publication number Publication date
JPH01299364A (ja) 1989-12-04
EP0343300A3 (fr) 1990-11-07
US4962691A (en) 1990-10-16
KR890017478A (ko) 1989-12-16

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